The author was pretty crap, true, but the content mostly. Lopez is a pretty lousy actor. I mean, remember her last movie? Of course not, no one saw it. And not only is she bad, she's also expensive so any chance of a quality supporting cast gets jeopardized. The worst though is that some nutcase upper management twit is going to remember that she's also a singer so they'll tack on a song for her. Probably disguise it as a karaoke scene.
And then there's the long-term, with reports like this
even if they're rumors I can't imagine how that'd play out when she's forced to play second banana to Tony Stark and Captain America.